Yury Gubich authored Jul 01, 2020 and Linus Jahn committed Jul 27, 2020

This changes the way MessageModel concludes whether the message is
suitable for correction. A message can be corrected, if:
 * it is `sentByMe()`
 * is amog the latest 20 messages sent by us
 * is not older than 2 days

Also instead of searching the message with the correct ID, the function
now uses the index from QML instead.